The rusty donut is when you get arrested, and the police officer says he'll only let you go if you eat his rusty donut, which means he wants you to lick his butthole.
by RapscallionATX July 07, 2006
The brown circle around your cornhole. Many mistake it as shit stains, but no need to worry, it is natural. Push your finger in and find the secret filling inside. The rusty ring donut is also the breakfast choice of many queers and prison inmates.
Mrs. Weathers who is the ultimate cunt-slut stated that she loves the taste of a warm creamy rusty ring donut when she has a nice hot Dickin's Cider.
by Wun Hung Lo December 19, 2005
by s rod June 04, 2006